Huh. I'm not sure this thing is even legal...

[Mr. Whippy]

My wife picked up a couple tools for working on the ductwork the other day.  She thought I'd be interested in the duct knife.



Looks harmless enough...



Hmm...
That's an interesting blade...



Wait a minute...
Serrated edge on on side, Plain edge on the other?  That's not the standard combo blade...


Serrations but both sides are sharpened.  Serrations on one side by also ground on the other side



Plain edge


Maybe they know there's some legality issues...



Oh, and it cuts through galvanized ductwork quite easily...  

[Anthony]

Make the handles black, a kydex sheath and that's a dead ringer for a $200 tactical covert dagger

Are there any markings on the blade of a manufacturer?

[Mike, Lord of the Spammers!]

Looks a bit like a Sog (who probably copied from them in the first place ) 

[MultiMat]

Are dual edged knives illegal in some parts of the US  .

Dual edge knives are illegal in OZ. Is it the whole stabbing thing  . Would the person being stabbed notice the difference

[Benner]

Totally legal here.

[Gareth]

Totally legal here.

It's not often we get to say that.

[Mike, Lord of the Spammers!]

Totally legal here.

We don't get to say that often

[nuphoria]

Oh cool, so I can have one of those but not a nice 3.01" penknife with a lock 

For f*cks sake.....

[Benner]

Make that, can't even have a 0.01" with a lock. 

[hawkchucker]

12 bucks for these at tool barn. Hmmm I think they would make good project blades.

[Sparky415]

Totally legal here.

We don't get to say that often

Only if you were a 'Duct worker' going to or from work 

[Sparky415]

Mrs Whippy is the best wife in the world! 

Don't tell my GF I said that or the whips would be out this end 

[Spoonrobot]

Are dual edged knives illegal in some parts of the US  .

A common theme here in the US are State laws banning the carry of dirks or daggers on one's person. It's generally perfectly legal to own them and keep them in your home but they're usually defined as weapons once you start carrying them about.

This site has an interesting blurb about why that is.

These knife laws are artifacts of fear -- of prejudice and
uncertainty. If you know a little American history, you can look at a
knife law's wording, and tell when it was first enacted...

* If it speaks of concealed dirks and daggers, it dates to the wave of
anarchist and pro-German terror bombings around 1915-1918, which
frightened an entire generation of Americans into surrendering their
liberty.

[John]

Mrs Whippy is the best wife in the world!  

Don't tell my GF I said that or the whips would be out this end  

I must keep my humour in check   

[Sparky415]

Go on you know you want to